Good communication with the professionals involved in your wedding is essential to avoid disappointing results. Speak to everyone ahead of time so they know exactly what you want.
First speak to your contact at the venue about the size and layout of the floor. How will people be arranged around it? Where will you be walking on from? What type of surface (carpet, tile, wood) will you be dancing on? Also ask if you can practice on it ahead of time. You’ll feel more relaxed if you can.
If you’ve had your song edited, make sure your DJ has a copy. If not, you may want to ask him or her to fade it out after a certain amount of time. He or she also needs to know when to start the music (i.e. as you’re announce, while you’re walking on, when you’re in position, or on your cue).
The photographer and videographer will approach your dance a little differently depending on what you’re doing, so tell them what to expect. If you’re doing a standard stand-and-sway (no judgement) they’ll stay close and focus on your faces and maybe take some shots of your feet. If you have something more elaborate planned they’ll want to move back a bit to be sure to fit it all in. Clue them in on any “spectacular” moves like lifts or dips so they know where to position themselves for the best shots.